*{
    margin: 0;
    padding: 0;
}

ul,ol,li{
    list-style: none;
}

a,a:active,a:hover,a:link{
    text-decoration: none;
    color: #333;
}

input,button,select,textarea{
    outline: none;
}

img{
    width: 100%;
    height: 100%;
    display: block;
}

/* 头部内容样式 */
.header{
    width: 1200px;
    height: 60px;
    background-color: skyblue;
    margin: 0 auto;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 30px;
    font-weight: 700;   /* 文字加粗 */
    color: white;
}

.header>p{
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    right: 30px;
    font-size: 20px;
    display: none;
}

.header>p.active{
    display: block;
}